1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/DateTimeFormat/day-period.js b/js/src/tests/non262/Intl/DateTimeFormat/day-period.js
new file mode 100644
index 0000000000..c21890e1b4
--- /dev/null
+++ b/js/src/tests/non262/Intl/DateTimeFormat/day-period.js
@@ -0,0 +1,40 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl")||release_or_beta)
+
+const {
+    Weekday, DayPeriod, Literal
+} = DateTimeFormatParts;
+
+const tests = [
+    // https://unicode-org.atlassian.net/browse/ICU-20741
+    {
+        date: new Date("2019-01-01T12:00:00"),
+        options: { dayPeriod: "long", weekday: "long", },
+        locales: {
+            "en-001": [Weekday("Tuesday"), Literal(", "), DayPeriod("noon")],
+        },
+    },
+
+    // https://unicode-org.atlassian.net/browse/ICU-20740
+    {
+        date: new Date("2019-01-01T12:00:00"),
+        options: { dayPeriod: "narrow", weekday: "long", },
+        locales: {
+            "bs-Cyrl": [Weekday("уторак"), Literal(" "), DayPeriod("подне")],
+        },
+    },
+];
+
+for (let {date, options, locales} of tests) {
+    for (let [locale, parts] of Object.entries(locales)) {
+        let dtf = new Intl.DateTimeFormat(locale, options);
+
+        assertEq(dtf.format(date), parts.map(({value}) => value).join(""),
+                 `locale=${locale}, date=${date}, options=${JSON.stringify(options)}`);
+
+        assertDeepEq(dtf.formatToParts(date), parts,
+                     `locale=${locale}, date=${date}, options=${JSON.stringify(options)}`);
+    }
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0, "ok");